Intro To Video

1. well i think that we used to use the file format, analog before we switched to digital

2. analog recording has reading signals directly onto a medium (tape) with a magnetic encoding but with digital it encodes the signals into a numeric string of digits.

3. with digital video you can edit and stuff much more easily then with analog because with analog you would have to start from scratch to add something in.

4. in video the frame rate is the number of frames shown per second. in the movies they use a frame rate of 24 frames per second.

5. not all applications use the same frame rate, for example, if the video is going to be shown on the web, CD-Rom or on a normal analog tape then you will have 3 different frame rates and 3 different resolutions. this is because in digital video the faster the frame rate and the higher the resolution determines how much data needs to be transmitted and stored in order to view your video.

6. resolution is the number of pixels (dots on the screen), it's measured as the number of horizontal pixels times the number of vertical pixels (eg. 680x 750)

7. The RGB colour system stands for red, green, blue. our monitors show us RGB colour and each pixel is the product of light coming from a red, green and a blue thingy which are placed really close together and because they're placed so close together our eyes blend the primary colours together and we see them as a single coloured dot. if you put your eye really close to the screen then you might see the following illustration

8. there are 3 different TV standards around the world and the standard you receive depends on the country you're living in. the USA, Canada, Japan, Korea and Mexico use the format NTSC and the frame rate is 29.97 frames/sec. Australia, China, most of Europe and South America use the format PAL and the frame rate is 25 frames/sec. France, the Middle East and most of Africa use the format SECAM and the frame rate is 25 frames/sec. sooo basically the main difference is the quality of the resolution and the frame rate.

9. us Aussies use the format PAL which may i remind you is a frame rate of 25 frames/sec.

10. if you're recording with an analog camcorder then you will need a video capture card to digitalize it.

11. we won't need a video capture card for the video we are making at school because it will already be digital to begin with.

12. an IEEE 1394 is the connection between your digital camcorder and your computer when you feed the video onto the computer after shooting it.

13. digital video cameras use video compression because when it's uncompressed it's an enormous amount of data and when viewing/editing it, it would slow down your computer a lot.

14. a codec handles the compression and decompression of video. they can be found in hardware like capture cards or in software.

15. generation loss is when the quality gets worse and worse as you copy or transfer. sir explained it this way : if you photocopy something it's not quite as good quality as the original and if you photocopy that photocopy then the quality will be even worse and if you keep photocopying every photocopy then you will probably end up with a big blob that doesn't really look like anything. the way i explained it, it probably doesn't make sense but anyways.....